/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.sql.parser.hive.ddl;

import org.apache.flink.sql.parser.ddl.SqlCreateView;
import org.apache.flink.table.catalog.config.CatalogConfig;

import org.apache.calcite.sql.SqlCharStringLiteral;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlNodeList;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;

/**
 * CREATE View DDL for Hive dialect.
 *
 * <p>CREATE VIEW [IF NOT EXISTS] [db_name.]view_name [(column_name [COMMENT column_comment], ...) ]
 *    [COMMENT view_comment]
 *    [TBLPROPERTIES (property_name = property_value, ...)]
 *    AS SELECT ...;
 */
public class SqlCreateHiveView extends SqlCreateView {

	private SqlNodeList originPropList;

	public SqlCreateHiveView(SqlParserPos pos, SqlIdentifier viewName, SqlNodeList fieldList, SqlNode query,
			boolean ifNotExists, SqlCharStringLiteral comment, SqlNodeList properties) {
		super(pos, viewName, fieldList, query, false, false, ifNotExists, comment, properties);
		originPropList = new SqlNodeList(properties.getList(), properties.getParserPosition());
		// mark it as a hive view
		properties.add(HiveDDLUtils.toTableOption(CatalogConfig.IS_GENERIC, "false", pos));
	}

	@Override
	public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
		writer.keyword("CREATE VIEW");
		if (isIfNotExists()) {
			writer.keyword("IF NOT EXISTS");
		}
		getViewName().unparse(writer, leftPrec, rightPrec);
		if (getFieldList().size() > 0) {
			getFieldList().unparse(writer, 1, rightPrec);
		}
		getComment().ifPresent(c -> {
			writer.newlineAndIndent();
			writer.keyword("COMMENT");
			c.unparse(writer, leftPrec, rightPrec);
		});
		if (originPropList.size() > 0) {
			writer.newlineAndIndent();
			writer.keyword("TBLPROPERTIES");
			SqlWriter.Frame withFrame = writer.startList("(", ")");
			for (SqlNode property : originPropList) {
				printIndent(writer);
				property.unparse(writer, leftPrec, rightPrec);
			}
			writer.newlineAndIndent();
			writer.endList(withFrame);
		}
		writer.newlineAndIndent();
		writer.keyword("AS");
		writer.newlineAndIndent();
		getQuery().unparse(writer, leftPrec, rightPrec);
	}
}
